Thickener for delivery of photographic emulsions
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United States of America Patent
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Oct 26, 1999
Issued Date -
N/A
app pub date -
Dec 30, 1993
filing date -
Dec 20, 1990
priority date (Note) -
Expired
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Abstract
The invention is generally accomplished by providing a photographic element and a process of its formation wherein a gelatin silver halide emulsion is provided with a thickener comprising a copolymer of the structure wherein A comprises about 10 to about 20 parts by weight of said copolymer, and B comprises about 80 to about 90 parts by weight of said copolymer. It is particularly preferred that the copolymer be provided in a hardener layer to minimize the amount of gelatin needed and thus reduce the reaction of hardener with gelatin. The invention finds a preferred use in curtain coating wherein there is a greater need for high viscosity materials, particularly at the bottom of a group of layers in order to minimize distortions of the layers as they are applied in the curtain coating process.
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